CN112578188A - Method and device for generating electric quantity waveform, computer equipment and storage medium - Google Patents
Method and device for generating electric quantity waveform, computer equipment and storage medium Download PDFInfo
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Abstract
The application relates to a method and a device for generating an electrical quantity waveform, a computer device and a storage medium. The method comprises the following steps: acquiring electrical quantity acquisition data of the power equipment; the electric quantity acquisition data corresponding to the target time is the target electric quantity; acquiring a reference electrical quantity waveform; taking data corresponding to the target time in the waveform of the reference electrical quantity as the reference electrical quantity; determining operation state change information of the power equipment according to the similarity of the target electrical quantity and the reference electrical quantity; updating the electric quantity acquisition data according to the running state change information; and generating an electrical quantity waveform of the electrical equipment according to the updated electrical quantity acquisition data. According to the scheme, part of the electrical quantity acquisition data corresponding to the electrical quantity waveform is replaced by data in the reference electrical quantity waveform, so that the storage capacity of the generated electrical quantity waveform is as small as possible, and the electrical quantity waveform as long as possible can be processed in a limited storage space.
Description
Technical Field
The present application relates to the field of power data processing technologies, and in particular, to a method and an apparatus for generating an electrical waveform, a computer device, and a storage medium.
Background
In order to monitor the operating state of the power equipment in the substation, the electrical quantity of the power equipment is often collected, and an electrical quantity waveform is generated and displayed based on the electrical quantity. For example, a fault waveform is generated and displayed by a fault recorder. In fact, the frequency of collecting the electrical quantity is often high, and the number of the electrical devices to be monitored in the substation is large. This results in a very large data volume of the generated electrical quantity waveform, which requires a huge storage capacity in a scenario where continuous monitoring of the electrical equipment is required.
Currently, a cyclic storage approach is used to reduce the need for storage capacity. However, this cannot store electrical energy for a long time.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present invention and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
In view of the above, it is necessary to provide a method and an apparatus for generating an electrical quantity waveform, a computer device, and a storage medium capable of generating an electrical quantity waveform having a storage capacity as small as possible.
A method of generating an electrical quantity waveform, the method comprising:
acquiring electrical quantity acquisition data of the power equipment; the electric quantity acquisition data corresponding to the target time is the target electric quantity;
acquiring a reference electrical quantity waveform; data corresponding to the target time in the reference electrical quantity waveform is a reference electrical quantity;
determining running state change information of the power equipment according to the similarity between the target electrical quantity and the reference electrical quantity;
updating the electrical quantity acquisition data according to the running state change information;
and generating the electrical quantity waveform of the electrical equipment according to the updated electrical quantity acquisition data.
An apparatus for generating an electrical quantity waveform, the apparatus comprising:
the acquisition data acquisition module is used for acquiring the electric quantity acquisition data of the power equipment; the electric quantity acquisition data corresponding to the target time is the target electric quantity;
the reference electrical quantity waveform acquisition module is used for acquiring a reference electrical quantity waveform; data corresponding to the target time in the reference electrical quantity waveform is a reference electrical quantity;
the change information acquisition module is used for determining the running state change information of the power equipment according to the similarity between the target electrical quantity and the reference electrical quantity;
the data updating module is used for updating the electrical quantity acquisition data according to the running state change information;
and the waveform generating module is used for generating the electrical quantity waveform of the electrical equipment according to the updated electrical quantity acquisition data.
A computer device comprising a memory and a processor, the memory storing a computer program, the processor implementing the following steps when executing the computer program:
acquiring electrical quantity acquisition data of the power equipment; the electric quantity acquisition data corresponding to the target time is the target electric quantity;
acquiring a reference electrical quantity waveform; data corresponding to the target time in the reference electrical quantity waveform is a reference electrical quantity;
determining running state change information of the power equipment according to the similarity between the target electrical quantity and the reference electrical quantity;
updating the electrical quantity acquisition data according to the running state change information;
and generating the electrical quantity waveform of the electrical equipment according to the updated electrical quantity acquisition data.
A computer-readable storage medium, on which a computer program is stored which, when executed by a processor, carries out the steps of:
acquiring electrical quantity acquisition data of the power equipment; the electric quantity acquisition data corresponding to the target time is the target electric quantity;
acquiring a reference electrical quantity waveform; data corresponding to the target time in the reference electrical quantity waveform is a reference electrical quantity;
determining running state change information of the power equipment according to the similarity between the target electrical quantity and the reference electrical quantity;
updating the electrical quantity acquisition data according to the running state change information;
and generating the electrical quantity waveform of the electrical equipment according to the updated electrical quantity acquisition data.
The method and the device for generating the electric quantity waveform, the computer equipment and the storage medium acquire electric quantity acquisition data of the power equipment and a target electric quantity corresponding to a target time; acquiring a reference electrical quantity waveform and a reference electrical quantity corresponding to a target time; determining operation state change information of the power equipment according to the electrical variation difference value of the target electrical quantity and the reference electrical quantity; updating the electric quantity acquisition data according to the running state change information; and generating an electrical quantity waveform of the electrical equipment according to the updated electrical quantity acquisition data. And a part of the electrical quantity acquisition data corresponding to the electrical quantity waveform is replaced by data in the reference electrical quantity waveform, so that the storage capacity of the generated electrical quantity waveform can be as small as possible, and the electrical quantity waveform as long as possible can be processed in a limited storage space.
Drawings
Fig. 1 is an application environment diagram of a method for generating an electrical quantity waveform in one embodiment;
FIG. 2 is a schematic flow chart illustrating a method for generating an electrical waveform according to an embodiment;
FIG. 3 is a schematic flow chart illustrating the generation of an electrical waveform in one embodiment;
FIG. 4 is a diagram illustrating an electrical quantity acquisition waveform and a primary wave model according to an embodiment;
FIG. 5 is a diagram illustrating an exemplary embodiment of a method for generating an electrical waveform;
FIG. 6 is a diagram illustrating randomly selected acquisition time points in one embodiment;
fig. 7 is a schematic flow chart of a method for generating an electrical quantity waveform according to another embodiment;
fig. 8 is a block diagram showing a structure of an electric quantity waveform generating apparatus according to an embodiment;
FIG. 9 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The method for generating the electrical quantity waveform provided by the application can be applied to the application environment shown in fig. 1. The application environment includes an electrical quantity collecting device 101 and a computer device 102 connected to a network, and the two devices can communicate with each other through the network. The electrical quantity acquisition device 101 acquires electrical quantity acquisition data of the power equipment and transmits the electrical quantity acquisition data to the computer device 102. The computer device 102 updates the electrical quantity collection data based on the electrical quantity collection data and the reference electrical quantity waveform, and generates an electrical quantity waveform of the power device based on the electrical quantity collection data subjected to the update processing. The electrical quantity collecting apparatus 101 may be, but is not limited to, various electrical measuring instruments having an electrical quantity collecting function, and specifically, may be various sensors, oscilloscopes, multimeters, and the like having an electrical quantity sensing function. The computer device 102 may refer to various devices with logical operation function, and may be implemented by a terminal or a server, where the terminal may be, but is not limited to, various personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices, and the server may be implemented by an independent server or a server cluster composed of multiple servers. In one embodiment, the computer device 102 may be a wave recorder device (wave recorder).
In an embodiment, as shown in fig. 2, a method for generating an electrical quantity waveform is provided, and this embodiment is exemplified by applying the method to a terminal, and it is to be understood that the method may also be applied to a server, and may also be applied to a system including a terminal and a server, and is implemented by interaction between the terminal and the server. The method comprises the following steps: the method comprises the following steps:
s201, acquiring electrical quantity acquisition data of the power equipment; and acquiring data of the electrical quantity corresponding to the target time as the target electrical quantity.
The power equipment (also referred to as grid equipment) may refer to various types of equipment in a substation, and may be a transformer, a generator, and the like. Electricity is a short term for Electrical Engineering (EE), and the core content is the subject of electricity research, including power generation, transformation, transmission and distribution. The electrical quantity refers to various parameters having a direct relation with electricity in the power system, and common classes such as voltage value, current value, frequency, impedance, capacitance, and the like. In one embodiment, the information that the stable variation rule exists is used as the electrical quantity to be collected, and the alternating voltage waveform (or data) conforms to the sine function rule, so that the alternating voltage data can be acquired and further subjected to subsequent processing to ensure the stability of the generated electrical quantity waveform.
The electrical quantity collection data (may also be referred to as actual collection data) refers to an electrical quantity of the electrical equipment collected by the electrical quantity collection device at a specific time or for a specific time period. In one embodiment, the electrical quantity collecting device monitors the electrical equipment in a wired or wireless manner to obtain the electrical quantity at a specific time, so as to obtain the electrical quantity collecting data. Further, the electrical quantity collection data may be recorded by means of a list or a waveform diagram. Furthermore, the electrical quantity collection data is an electrical quantity list formed by electrical quantities at various times, and can also be an electrical quantity oscillogram.
The target time may refer to a specific time or a specific time period. Further, the target time may be at least one discontinuous time, or may be at least one discontinuous time period (the length of the time period may be determined according to actual conditions, and the lengths of the time periods may be the same or different).
In one embodiment, when receiving the electrical quantity collection data sent by the electrical quantity collection device, the terminal extracts a target electrical quantity corresponding to the target time from the electrical quantity collection data to perform the next analysis.
S202, acquiring a reference electric quantity waveform; and the data corresponding to the target time in the reference electrical quantity waveform is a reference electrical quantity.
The reference electrical quantity waveform may refer to a theoretical waveform reflecting the electrical quantity principle, and may also be referred to as a primary wave or a primary wave model. In one embodiment, the reference electrical quantity waveform may be a function waveform capable of reflecting the fluctuation form of the electrical quantity.
In S202, after acquiring the reference electrical quantity waveform, the terminal determines the electrical quantity corresponding to the target time as the reference electrical quantity.
In one embodiment, the terminal acquires the reference electrical quantity waveform to determine whether the electrical quantity corresponding to the waveform can be used to replace the corresponding electrical quantity in the electrical quantity collection data, so as to reduce the storage space required by the waveform.
S203, determining the operation state change information of the power equipment according to the similarity of the target electrical quantity and the reference electrical quantity.
The target electrical quantity and the reference electrical quantity are both electrical quantities corresponding to the target time, and S203 determines the similarity of the two electrical quantities, and determines the operation state change information of the power equipment according to the similarity. According to the operation state change information, whether the corresponding electrical quantity in the electrical quantity acquisition data can be replaced by the electrical quantity corresponding to the waveform can be determined.
The similarity determination process between the target electrical quantity and the reference electrical quantity may be: an electrical change amount of the target electrical quantity in the target time and an electrical change amount of the reference electrical quantity in the target time are determined, and a difference between the two electrical change amounts is determined as a similarity between the target electrical quantity and the reference electrical quantity. The following steps can be also included: and determining the electric quantity value of the target electric quantity in the target time and the electric quantity value of the reference electric quantity in the target time, and determining the difference between the two electric quantity values as the similarity between the target electric quantity and the reference electric quantity. The method can also comprise the following steps: and the similarity of the electrical quantity acquisition waveform in the target time and the reference electrical quantity waveform on the waveform form is determined as the similarity between the target electrical quantity and the reference electrical quantity.
The operation state change information of the power equipment may refer to stability of the operation state of the power equipment. The operating states may include a steady-state operating state (which may also be referred to as a non-fault state) and a non-steady-state operating state (which may also be referred to as a fault state), among others. The steady-state operation state may refer to a normal operation state of the power equipment, that is, a state in which the electrical quantity of the power equipment is in a steady continuous change. The unsteady operating state may refer to a fault state of the power equipment, and may specifically be a ground fault, a phase-to-phase fault, an electrical oscillation, or the like, where in the unsteady operating state, an electrical quantity of the power equipment may have a sudden change or a discontinuous state.
In one embodiment, the fundamental and multiple harmonics of the electrical quantity are derived by expanding the electrical quantity in a Fourier series. When the fundamental wave changes stably, the power equipment can be regarded as being in steady operation.
In one embodiment, when the target time is more than one, electrical variation difference values of the target electrical quantity and the reference electrical quantity may be determined, respectively, and the operating state variation information of the electrical equipment may be determined based on the electrical variation difference values.
And S204, updating the electrical quantity acquisition data according to the running state change information.
The inventor finds that: under the condition of steady-state operation, the waveform of the electrical quantity is consistent with the condition of primary wave variation, the error of the waveform of the electrical quantity mainly comes from the slight disturbance of a power system, such as inductive heavy-load switching and the like, the steady-state margin of a power grid has the capacity of resisting the slight interference, the error of the waveform of the electrical quantity is eliminated, and the electrical quantity of the power equipment is recovered to the primary wave orbital operation. When large disturbance occurs, the error of the electric quantity waveform is suddenly changed and exceeds the steady-state margin of the power grid, so that the electric quantity waveform cannot be restored to the original wave track, and normal operation can be restored only after the operation mode of the power equipment is changed and adjusted. Based on this, according to the embodiment of the invention, the operation state change information of the power equipment is determined according to the electrical variation difference, and different updating processing is performed on the electrical quantity acquisition data according to different operation state change information. For example: and when the operation state change information is in steady-state operation, replacing the target electrical quantity in the electrical quantity acquisition data with the reference electrical quantity, and when the operation state change information is in unsteady-state operation, reserving the target electrical quantity in the electrical quantity acquisition data.
And S205, generating an electrical quantity waveform of the electrical equipment according to the updated electrical quantity acquisition data.
And converting the updated electrical quantity acquisition data into a waveform to obtain the electrical quantity waveform of the electrical equipment.
In one embodiment, the terminal may display the electrical quantity waveform in an interface.
In practical application scenarios, the terminal often needs to record the waveform of the electrical quantity in real time, for example, the waveform at all times, including fault and non-fault states, is recorded with the time length of one minute as the horizontal axis. The storage space of the part is large, so that the general wave recorder can only record the electric quantity waveform within one week at most. When the time of one week is up, the waveform of the electrical quantity of the previous week needs to be replaced repeatedly, and like a vehicle data recorder, the recorded waveform of the electrical quantity is limited, which is not beneficial to long-term monitoring of the state of the power equipment. In the method for generating the electrical quantity waveform, part of electrical quantity acquisition data corresponding to the electrical quantity waveform is replaced by data in the reference electrical quantity waveform, so that the storage capacity of the generated electrical quantity waveform is as small as possible, the electrical quantity waveform as long as possible can be processed in a limited storage space, and the long-term monitoring of the state of the power equipment can be realized.
In one embodiment, the determining the operation state change information of the electrical equipment according to the similarity between the target electrical quantity and the reference electrical quantity includes: determining whether the difference value of the electrical variation of the target electrical quantity and the reference electrical quantity meets a preset condition; when a preset condition is met, judging that the running state change information is in steady-state running; and when the preset condition is not met, judging that the running state change information is unsteady running.
Taking the electrical quantity as the ac voltage as an example, the electrical variation difference (denoted as λ) can be calculated by the following formula:
λ＝uR-uG
wherein u isRRepresenting the target voltage, u, corresponding to the voltage acquisition dataGAnd a reference voltage corresponding to the waveform of the reference electrical quantity. By comparing the target voltage with the reference voltage, whether the power equipment is abnormal in the actual operation process can be determined, namely whether the power equipment is in a steady-state operation state is determined. Further, when it is determined that the electrical quantity of the electrical equipment has a large value difference when the electrical variation difference is large, it may be considered that the electrical quantity of the electrical equipment has shifted, that is, the electrical equipment is in an unsteady operation. Otherwise, the power plant may be considered to be in steady state operation.
In one embodiment, whether the electrical variation difference satisfies the preset condition may be comparing the electrical variation difference with a preset variation difference threshold to determine whether the electrical variation difference satisfies the preset condition according to the comparison result.
According to the method for generating the electric quantity waveform, the operation state change information of the power equipment is determined according to the electric variation difference, the determination process is simple, the operation state change information of the power equipment can be determined quickly, and the generation efficiency of the electric quantity waveform can be improved.
In one embodiment, the determining whether the difference between the target electrical quantity and the reference electrical quantity satisfies a preset condition includes: determining an electrical variation difference between the target electrical quantity and the reference electrical quantity; and determining whether the electrical variation difference is smaller than a preset variation difference threshold.
The variation difference threshold may be determined according to actual conditions, for example: 2%, 5%, etc. When the electrical variation difference is smaller than the variation difference threshold, it is determined that the electrical quantity of the electrical equipment does not fluctuate greatly, and the operation state variation information may be determined to be steady-state operation.
In the above-described embodiment, whether the deviation between the target electrical quantity and the reference electrical quantity is large is determined based on the variation difference threshold, and the operating state change information of the electrical equipment is accurately determined based on the deviation.
In one embodiment, the electrical quantity collection data is updated according to the running state change information; generating an electrical quantity waveform of the electrical equipment according to the electrical quantity acquisition data subjected to updating processing, wherein the generating comprises the following steps: when the operation state change information is in steady-state operation, replacing the target electrical quantity in the electrical quantity acquisition data with the reference electrical quantity; and generating the electrical quantity waveform of the electrical equipment according to the electrical quantity acquisition data subjected to the replacement processing.
When the power equipment is in steady operation, the corresponding electrical quantity waveform is always stable and fluctuated, namely, the waveform conforms to the reference electrical quantity waveform, so that the electrical quantity in the electrical quantity acquisition data can be replaced by the electrical quantity in the reference electrical quantity waveform, and the electrical quantity acquisition data with a large data quantity can be replaced by the reference electrical quantity with a small data quantity. The storage space required for the electrical quantity waveform can be greatly reduced.
In one embodiment, the electrical quantity collection data is updated according to the running state change information; generating an electrical quantity waveform of the electrical equipment according to the electrical quantity acquisition data subjected to updating processing, wherein the generating comprises the following steps: when the operation state change information is unsteady operation, the target electrical quantity in the electrical quantity acquisition data is reserved; and generating an electrical quantity waveform of the electrical equipment according to the electrical quantity acquisition data.
When the power equipment is in unsteady operation, the corresponding electrical quantity waveform is often abrupt change, that is, the electrical quantity waveform does not conform to the reference electrical quantity waveform, so that the electrical quantity in the electrical quantity acquisition data cannot be replaced by the electrical quantity in the reference electrical quantity waveform, and the electrical quantity waveform is directly reserved, so that the generated electrical quantity waveform can accurately reflect the actual operation state of the power equipment.
In one embodiment, the target time is a time corresponding to a target time period; the determining a difference in electrical variation between the target electrical quantity and the reference electrical quantity includes: determining the variation of the target electrical quantity in the target time period to obtain a first variation; determining the variation of the reference electrical quantity in the target time period to obtain a second variation; determining a variation difference value of the first variation and the second variation as the electrical variation difference value.
The duration of the target time period may be determined according to the collection period of the electrical quantity collection device, for example, one (or more) collection periods are determined as the target time period, and the target time period may also be referred to as a fixed collection interval. Specifically, the electrical quantity variation amount of the target electrical quantity between the adjacent two collection points (a1 and a2) is determined as a first variation amount, and the electrical quantity variation amount of the reference electrical quantity between the adjacent two collection points (a1 and a2) is determined as a second variation amount. Specifically, for the case where the acquisition frequency is 5000Hz, the duration of the target time period may be 0.2 ms.
In one embodiment, the electrical change may be calculated by the following equation: lambda [ alpha ]s＝uΔ-u0；
Wherein u is0Is the electrical quantity at the first moment of the target time period uΔIs the electrical quantity at the last instant of the target time period.
For waveform data with fixed acquisition intervals, lambda can be calculated by using the original wave and the actually acquired datasAnd judging the difference value. Namely:
determine lambdasR-λsG＝(uΔR-u0R)-(uΔG-u0G)＝uΔR-uΔG+u0G-u0RIf the result is larger than the variation difference threshold, the waveform is judged to be deviated, otherwise, the power equipment is considered to keep steady-state operation.
In one embodiment, the target time is a time corresponding to a target time; the determining a difference in electrical variation between the target electrical quantity and the reference electrical quantity includes: determining the variation of the target electrical quantity at the target moment to obtain a third variation; determining the variation of the reference electrical quantity at the target moment to obtain a fourth variation; determining a variation difference value of the third variation and the fourth variation as the electrical variation difference value.
The target time may be more than one, and whether the electrical quantity of the corresponding time period changes stably or not may be determined based on the electrical quantity variation difference at these times, so as to determine whether the power equipment is in a stable operation state or not.
The embodiment determines whether the power equipment is in the stable operation state or not based on the electric quantity at the specific moment, the determination process is simple, the required operand is small, and the generation efficiency of the electric quantity waveform can be effectively improved.
In one embodiment, the primary wave may be used in place of the actual acquired data waveform in the case of steady state operation of the power plant. Judging whether the difference between the currently acquired waveform data and the original wave data is within an allowed range, if so, reserving the original wave model, namely, replacing the actually acquired data waveform with the original wave model; otherwise, no replacement processing is performed, after which corresponding data may be recorded to generate the electrical quantity waveform.
In one embodiment, the target electrical quantity may be subjected to fourier series expansion, and a variation of the expanded fundamental wave in the target time period is determined, so as to obtain the first variation; performing Fourier series expansion on the reference electric quantity, and determining the variation of the fundamental wave obtained by expansion in a target time period to obtain a second variation; and determining a variation difference value of the first variation and the second variation as an electrical variation difference value.
In one embodiment, when the operation state change information corresponding to the target time period is determined to be in steady operation, an electrical quantity collection waveform corresponding to the target time period is determined in the electrical quantity collection waveform, a reference electrical quantity waveform corresponding to the target time period in the reference electrical quantity waveform is determined, the reference electrical quantity waveform is used for replacing the electrical quantity collection waveform, and the electrical quantity waveform of the power equipment is generated according to the replaced collection waveform.
In one embodiment, time periods of a specific length are sequentially determined in time series as target time periods. And for a certain target time period, determining whether the reference electrical quantity waveform is required to replace the electrical quantity collecting waveform, if so, replacing the electrical quantity collecting waveform with the reference electrical quantity waveform of the target time period, and if not, reserving the electrical quantity collecting waveform. And at the moment, finishing the waveform updating process of the target time period, processing the next target time period, determining whether the reference electrical quantity waveform is required to replace the electrical quantity acquisition waveform, if so, replacing the electrical quantity acquisition waveform with the reference electrical quantity waveform of the target time period, and if not, keeping the electrical quantity acquisition waveform. And by analogy, the waveform obtained by updating is output as the electrical quantity waveform of the power equipment until the whole electrical quantity acquisition waveform updating process is completed.
The waveform updating process in one embodiment may be as shown in fig. 3, where the electrical quantity collecting waveform is 301 and the reference electrical quantity waveform is 302. And for the target time period, determining that a fault waveform exists in the electric quantity acquisition waveform through comparison of the electric variation difference, and extracting the fault waveform in the electric quantity acquisition waveform of the target time period. And no fault waveform exists in other time periods other than the target time period, and therefore, the waveform in the reference electrical quantity waveform of the target time period is extracted. The waveforms of the two parts are combined according to a time sequence, and the electric quantity waveform 303 of the power equipment is obtained.
In the embodiment, the electrical variation difference is obtained according to the variation difference between the variation of the electrical quantity collected data and the variation of the primary wave, and it is further determined whether the power equipment is in a steady-state operation state. When the power equipment is in a steady-state operation state, most of the data in the electrical quantity acquisition data can be replaced by the waveform function corresponding to the primary wave, so that the requirement of the finally generated electrical quantity waveform on a storage space is greatly reduced.
In one embodiment, before determining the operation state change information of the electrical equipment according to the similarity between the target electrical quantity and the reference electrical quantity, the method further includes: determining a fixed acquisition time point of the electrical quantity acquisition data according to a preset acquisition frequency; randomly selecting at least one acquisition time point from the fixed acquisition time points as the target time; determining the target electrical quantity corresponding to the target time in the electrical quantity acquisition data; determining the reference electrical quantity corresponding to the target time in the reference electrical quantity waveform.
The acquisition frequency may be determined according to actual conditions, for example, 5000 Hz.
In one embodiment, a number of random acquisition time points may be determined, according to which the corresponding acquisition time point is randomly selected among the fixed acquisition time points. These acquisition time points may be used as target times, and time periods corresponding to these acquisition time points may also be determined as target times.
Further, the operation state change information of the electrical equipment at each target time is respectively determined, whether the target electrical quantity needs to be replaced by the reference electrical quantity at each target time is determined, and after the electrical quantity collection data at each target time is replaced, the electrical quantity waveform of the electrical equipment is generated according to the updated electrical quantity collection data.
In one embodiment, fig. 4 is a relationship between waveforms collected for electrical quantities of an electrical power device in a steady state operating condition. The electrical quantity acquisition waveform corresponding to the electrical quantity acquisition data in fig. 4 includes two forms: 1. acquiring data points from the electrical quantity acquisition data at a fixed acquisition time, and obtaining an electrical quantity acquisition waveform based on the acquired data points; 2. data points are collected from the electrical quantity collection data at random collection times, and an electrical quantity collection waveform is obtained based on the data of the collected data points. As can also be seen from fig. 4, when the power equipment is in a steady-state operation state, the electrical quantity collection waveform corresponds to the form of the primary wave model, and therefore, the corresponding electrical quantity collection waveform can be replaced by the primary wave model.
According to the embodiment, the difference value of the original wave data at the random time and the actually acquired data is compared, the error factor at the acquisition time is increased by using the strong uncertainty of the random number, so that the judgment of the steady-state operation of the power equipment is completed, the operation state of the power equipment can be accurately and quickly determined under the condition of reducing the calculated amount, and the generation efficiency of the electric quantity waveform can be effectively improved.
In one embodiment, the obtaining a reference electrical quantity waveform includes: acquiring historical electric quantity acquisition data of the power equipment in a set historical time period; and the trigger waveform generation model constructs a trigonometric function waveform according to the historical electrical quantity acquisition data to obtain the reference electrical quantity waveform.
The specific time for setting the historical time period may be determined according to actual conditions, and may be, for example, the past day, week, and the like.
The waveform generation model refers to a model capable of generating a waveform of an electrical quantity, and may be a neural network model. In one embodiment, the waveform generation model is trained through historical electrical quantity acquisition data, and the trained waveform generation model is obtained. When the updated electric quantity acquisition data is received, the trained waveform generation model carries out waveform generation processing on the updated electric quantity acquisition data, and then the electric quantity waveform of the power equipment is output.
The trigonometric function waveform may be a cosine function waveform, a sine function waveform, or the like.
In one embodiment, taking an ac voltage as an example, the constructed sine function may be as follows:
wherein, under the power frequency condition, ω ═ 2 π f ≈ 314.16; u shapemRepresents the maximum value of the instantaneous value of U, U for 500, 220, 110kV power systemsm＝707kV、311kV、155kV；φuIndicating the initial phase.
In one embodiment, the voltage amplitude and frequency at least two time instants are determined in the historical electrical quantity acquisition data and input into the waveform generation model. The waveform generation model substitutes the voltage amplitude and frequency into the sine function to determine the initial phase phiuAnd further obtaining an expression of the sine function, and outputting a corresponding sine function waveform based on the expression of the sine function.
Further, a wave band corresponding to the reference electrical quantity in the sine function waveform is determined, and the wave band is used for replacing the wave band in the waveform corresponding to the electrical quantity acquisition data, so that the electrical waveform of the power equipment is obtained.
In one embodiment, referring to fig. 5, after receiving the electrical quantity collection data sent by the electrical quantity collection device, the terminal updates the electrical quantity collection data through comparison with a reference electrical quantity waveform, generates an electrical quantity waveform based on the updated electrical quantity collection data, and stores the electrical quantity waveform in a storage space (e.g., a memory). Compared with the original electrical quantity acquisition equipment sent by the electrical quantity acquisition equipment, the updated electrical quantity acquisition data has the advantage that the data quantity is greatly reduced, so that the required storage space response is reduced, and the capacity required by the electrical quantity waveform of the power equipment is effectively reduced. For a limited storage space, it is possible to store the waveform of the electrical quantity for a longer time.
In one embodiment, as shown in fig. 6, a method for generating an electrical quantity waveform is provided, which is described by taking the method as an example for being applied to a terminal, and includes the following steps:
s601, receiving electric quantity acquisition data of the power equipment, which is sent by the electric quantity acquisition equipment.
S602, acquiring historical electric quantity acquisition data of the power equipment in a set historical time period; and the trigger waveform generation model constructs a trigonometric function waveform according to the historical electrical quantity acquisition data to obtain a reference electrical quantity waveform.
S603, determining a fixed acquisition time point of the electrical quantity acquisition data according to a preset acquisition frequency; at least one acquisition time point is randomly selected from the fixed acquisition time points, and a target time period is determined according to the selected at least one acquisition time point.
S604, determining a target electric quantity corresponding to a target time period in the electric quantity acquisition data; and determining the variation of the target electrical quantity in the target time period to obtain a first variation.
S605, determining a reference electric quantity corresponding to a target time period in the reference electric quantity waveform; and determining the variation of the reference electric quantity in the target time period to obtain a second variation.
S606, determining a variation difference value of the first variation and the second variation as an electrical variation difference value; and determining whether the electrical variation difference is smaller than a preset variation difference threshold.
S607, when the electrical variation difference is smaller than or equal to the preset variation difference threshold, determining that the operation state variation information of the power equipment is in steady operation; and replacing the target electrical quantity in the electrical quantity acquisition data with the reference electrical quantity.
S608, when the electrical variation difference is larger than a preset variation difference threshold, determining that the operation state variation information of the power equipment is in unsteady operation; and reserving the target electrical quantity in the electrical quantity acquisition data.
And S609, generating an electrical quantity waveform of the electrical equipment according to the updated electrical quantity acquisition data.
In the embodiment, the part of the electrical quantity acquisition data corresponding to the electrical quantity waveform is replaced by the data in the reference electrical quantity waveform, so that the storage capacity of the generated electrical quantity waveform can be as small as possible, the electrical quantity waveform as long as possible can be processed in a limited storage space, meanwhile, the electrical quantity data of the power equipment in an unstable operation state is kept, and the finally formed electrical quantity waveform can accurately present the form corresponding to the original electrical quantity acquisition data.
In an embodiment, as shown in fig. 7, an application scenario of a method for generating an electrical quantity waveform is provided, which is described by taking an example that the method is applied to a wave recording device, and includes the following steps:
and S701, receiving voltage actual acquisition data sent by the voltage acquisition equipment.
And S702, obtaining a primary wave model.
S703, comparing the electrical quantity in the target time period to obtain an electrical variation difference value:
for a scenario with a fixed acquisition interval, the sampling frequency of the voltage acquisition device is determined, two adjacent acquisition points are selected according to the sampling frequency, and the time period between the two acquisition points (a1 and a2) is determined as a target time period.
Determining a1Actual voltage acquisition data u at acquisition pointORAnd a2Actual voltage acquisition data u at acquisition point△RWill uORAnd u△RIs determined as the first variation.
Determining a1Electric quantity u corresponding to primary wave model under acquisition pointOGAnd a2Electric quantity u corresponding to primary wave model under acquisition point△GWill uOGAnd u△GIs determined as the second variation.
Determining an electrical variation difference value in the target time period according to the first variation and the second variation:
λsR-λsG＝(uΔR-u0R)-(uΔG-u0G)＝uΔR-uΔG+u0G-u0R
and S704, determining whether the electrical variation difference is smaller than the variation difference threshold.
S705, if the electrical variation is less than or equal to 5%, the power equipment is considered to keep stable operation, and the original wave model of the target time period is used for replacing the voltage of the target time period to actually acquire a data waveform; and recording the data as primary wave model data.
S706, if the electrical variation is larger than 5%, the power equipment is considered to be in unsteady state operation, and the voltage actually acquired data waveform is reserved; and recording the voltage as actual collected data. When the continuous acquisition time is judged to be in steady-state operation, the continuous time can be recorded as the primary wave model data, and the data of the section can be replaced by the primary wave model data, namely the actual voltage acquisition data ut1，ut2……utnCan be covered
t＝t1,t2……tnAnd (4) replacing.
And S707, the wave recording device generates an electrical quantity waveform of the power equipment based on the processed voltage acquisition data and displays the electrical quantity waveform on an interface.
Taking IEC61850-9-2LE standard sampling value frame as an example, the actual acquisition data frame at each acquisition time is 36 bytes, while the primary wave model only needs to record the time point data, the size is 2 bytes, and the data amount is 5.55% of the former.
Taking single-channel data with the acquisition frequency of 5000Hz as an example, the data volume acquired per second is 175.8KB, and the data volume is 9.77KB after the data is recorded by adopting a primary wave model.
Generally, the acquisition frequency of the fault recorder is at least greater than 5000Hz, that is, more than 5000 waveform data points are acquired per second, and under the power frequency condition, more than 100 samples are acquired per period. For a fault waveform of a single channel, the data volume can reach 150KB/s, for a 220kV transformer substation configured with 4 main transformers, 6 220kV lines and 12 110kV lines, the number of the channels is 800, the data volume of continuous wave recording reaches 117.2MB/s theoretically, data exceeding 9888GB can be generated every day, and a fault wave recording system of the transformer substation needs to be configured with a high-speed memory exceeding 3524TB according to the calculation of total station wave recording data stored for one year. In addition, temporary waveform data such as startup recording data and manual recording data exist, and the required data storage amount is larger than 3800 TB. For the transformer substation, the electric quantity waveform generation method is adopted, and data of one year can be reduced to 195 TB.
The data flow based on the fixed acquisition interval is stable, the service life of the storage can be prolonged, the data volume can be reduced to 5.55%, and the capacity requirement of the storage is greatly saved. For a 220kV substation, the 195TB data volume is still a large storage requirement. Therefore, in one embodiment, a variable acquisition interval (variable frequency) calculation method is adopted, and the raw wave calculation and the actual acquisition at random time are used for difference comparison. The specific implementation mode is as follows:
and receiving voltage actual acquisition data sent by the voltage acquisition equipment and acquiring a primary wave model.
And comparing the electrical quantity of the target time period to obtain an electrical variation difference.
For a sampling frequency of 5000Hz, 10 acquisition points may be randomly selected. The time period between two adjacent ones of the acquisition points (b1 and b2) is respectively determined as the target time period.
Taking one of the target time periods T1 as an example, b is determined1Actual voltage acquisition data u at acquisition pointORAnd b2Actual voltage acquisition data u at acquisition point△RWill uORAnd u△RIs determined as the first variation.
Determination of b1Electric quantity u corresponding to primary wave model under acquisition pointOGAnd b2Electric quantity u corresponding to primary wave model under acquisition point△GWill uOGAnd u△GIs determined as the second variation.
Determining an electrical variation difference value in the target time period according to the first variation and the second variation:
λsR-λsG＝(uΔR-u0R)-(uΔG-u0G)＝uΔR-uΔG+u0G-u0R
it is determined whether the electrical delta difference is less than a delta difference threshold.
If the electrical variation difference is less than or equal to 5%, the power equipment is considered to keep steady-state operation, and the original wave model of the target time period is used for replacing the voltage of the target time period to actually acquire the data waveform; and recording the data as primary wave model data.
If the difference value of the electrical variation is larger than 5%, the power equipment is considered to be in unsteady state operation, and the voltage actually acquired data waveform is reserved; and recording the voltage as actual collected data. When the continuous acquisition time is judged to be in steady-state operation, the continuous time can be recorded as the primary wave model data, and the data of the section can be replaced by the primary wave model data, namely the actual voltage acquisition data ut1，ut2……utnCan be covered
t＝t1,t2……tnAnd (4) replacing.
Next, a difference comparison is performed on the next target period T1, and the replacement or retention processing of the waveform is completed according to the result of the difference comparison. And the other target time periods are analogized until the processing of all the target time periods is completed. And generating an electrical quantity waveform of the power equipment according to the processed collected data waveform.
In the embodiment, the error factor at the acquisition time is increased by using the strong uncertainty of the random number, the judgment of the steady-state operation is completed by checking the difference value between the actual acquisition value at the random time and the primary wave calculation data, and the calculation amount can be reduced on the basis of ensuring the accuracy. In addition, for a scene with a sampling frequency of 5000Hz, the total data volume can be reduced by 99.8% on the basis of a fixed acquisition interval. Taking the 220kV substation above as an example, the actual acquisition data storage capacity requirement for the fixed acquisition interval is about 3500TB, the raw wave model data storage capacity requirement for the fixed acquisition interval is 195TB, and the raw wave model data storage capacity requirement for the variable acquisition interval is about 0.39 TB. The capacity requirement is reduced by 99.989 percent compared with the currently applied storage mode. The cost of the intelligent data application expansion of the transformer substation is greatly reduced.
It should be understood that, although the steps in the above-described flowcharts are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the above-mentioned flowcharts may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or the stages is not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a part of the steps or the stages in other steps.
Based on the same idea as the method of generating an electrical quantity waveform in the above-described embodiment, the present invention also provides a device for generating an electrical quantity waveform, which can be used to execute the above-described method of generating an electrical quantity waveform. For convenience of explanation, in the schematic structural diagram of the embodiment of the electrical quantity waveform generation device, only the part related to the embodiment of the present invention is shown, and those skilled in the art will understand that the illustrated structure does not constitute a limitation to the device, and may include more or less components than those illustrated, or combine some components, or arrange different components.
In one embodiment, as shown in fig. 8, there is provided an apparatus 800 for generating an electrical quantity waveform, which may be a part of a computer device using a software module or a hardware module, or a combination of the two modules, and specifically includes: the device comprises a collected data acquisition module 801, a reference electrical quantity waveform acquisition module 802, a change information acquisition module 803, a data updating module 804 and a waveform generation module 805, wherein:
a collected data acquisition module 801, configured to acquire electrical quantity collected data of the power device; and acquiring data of the electrical quantity corresponding to the target time as the target electrical quantity.
A reference electrical quantity waveform obtaining module 802, configured to obtain a reference electrical quantity waveform; and the data corresponding to the target time in the reference electrical quantity waveform is a reference electrical quantity.
A change information obtaining module 803, configured to determine operation state change information of the electrical device according to the similarity between the target electrical quantity and the reference electrical quantity.
And the data updating module 804 is configured to update the electrical quantity acquisition data according to the operation state change information.
The waveform generating module 805 is configured to generate an electrical quantity waveform of the electrical device according to the updated electrical quantity collecting data.
In the above-mentioned electric quantity waveform generation device, a part of the electric quantity collected data corresponding to the electric quantity waveform is replaced by data in the reference electric quantity waveform, so that the storage capacity of the generated electric quantity waveform can be made as small as possible, and the electric quantity waveform as long as possible can be processed in a limited storage space.
In one embodiment, the change information acquisition module includes: a variation difference judgment submodule, configured to determine whether an electrical variation difference between the target electrical quantity and the reference electrical quantity meets a preset condition; the steady-state operation judgment submodule is used for judging that the operation state change information is steady-state operation when a preset condition is met; and the unsteady state operation judgment sub-module is used for judging that the operation state change information is unsteady state operation when the preset condition is not met.
In one embodiment, the apparatus further comprises: the data replacement module is used for replacing the target electrical quantity in the electrical quantity acquisition data with the reference electrical quantity when the operation state change information is in steady operation; and the electrical quantity waveform generating module is used for generating the electrical quantity waveform of the electrical equipment according to the electrical quantity acquisition data subjected to replacement processing.
In one embodiment, the variation difference determination sub-module includes: a variation difference determination unit configured to determine an electrical variation difference between the target electrical quantity and the reference electrical quantity; and the variation difference value judging unit is used for determining whether the electrical variation difference value is smaller than a preset variation difference value threshold value.
In one embodiment, the target time is a time corresponding to a target time period; a variation difference determination unit including: the first variation determining subunit is configured to determine a variation of the target electrical quantity in the target time period, so as to obtain a first variation; the second variation determining subunit is configured to determine a variation of the reference electrical quantity in the target time period, so as to obtain a second variation; a variation difference determination subunit operable to determine a variation difference between the first variation and the second variation as the electrical variation difference.
In one embodiment, the apparatus further comprises: the fixed time point determining module is used for determining a fixed acquisition time point of the electrical quantity acquisition data according to a preset acquisition frequency; a time point selection module for randomly selecting at least one acquisition time point from the fixed acquisition time points as the target time; a target electrical quantity determination module, configured to determine the target electrical quantity corresponding to the target time in the electrical quantity collection data; a reference electrical quantity determination module configured to determine the reference electrical quantity corresponding to the target time in the reference electrical quantity waveform.
In one embodiment, the reference electrical quantity waveform obtaining module includes: the historical data acquisition submodule is used for acquiring historical electric quantity acquisition data of the power equipment in a set historical time period; and the waveform construction submodule is used for triggering a waveform generation model to construct a trigonometric function waveform according to the historical electrical quantity acquisition data so as to obtain the reference electrical quantity waveform.
For specific definition of the generating device of the electrical quantity waveform, reference may be made to the above definition of the generating method of the electrical quantity waveform, and details are not described here. The respective modules in the above-described electric quantity waveform generation apparatus may be entirely or partially realized by software, hardware, and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 9. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a method of generating a waveform of an electrical quantity. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 9 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is further provided, which includes a memory and a processor, the memory stores a computer program, and the processor implements the steps of the above method embodiments when executing the computer program.
In an embodiment, a computer-readable storage medium is provided, in which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method embodiments.
In one embodiment, a computer program product or computer program is provided that includes computer instructions stored in a computer-readable storage medium. The computer instructions are read by a processor of a computer device from a computer-readable storage medium, and the computer instructions are executed by the processor to cause the computer device to perform the steps in the above-mentioned method embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method of generating an electrical quantity waveform, the method comprising:
acquiring electrical quantity acquisition data of the power equipment; the electric quantity acquisition data corresponding to the target time is the target electric quantity;
acquiring a reference electrical quantity waveform; data corresponding to the target time in the reference electrical quantity waveform is a reference electrical quantity;
determining running state change information of the power equipment according to the similarity between the target electrical quantity and the reference electrical quantity;
updating the electrical quantity acquisition data according to the running state change information;
and generating the electrical quantity waveform of the electrical equipment according to the updated electrical quantity acquisition data.
2. The method according to claim 1, wherein the determining the operational state change information of the electrical power equipment according to the similarity of the target electrical quantity and the reference electrical quantity comprises:
determining whether the difference value of the electrical variation of the target electrical quantity and the reference electrical quantity meets a preset condition;
when a preset condition is met, judging that the running state change information is in steady-state running;
and when the preset condition is not met, judging that the running state change information is unsteady running.
3. The method according to claim 2, wherein the electrical quantity collection data is updated according to the operation state change information; generating an electrical quantity waveform of the electrical equipment according to the electrical quantity acquisition data subjected to updating processing, wherein the generating comprises the following steps:
when the operation state change information is in steady-state operation, replacing the target electrical quantity in the electrical quantity acquisition data with the reference electrical quantity;
and generating the electrical quantity waveform of the electrical equipment according to the electrical quantity acquisition data subjected to the replacement processing.
4. The method according to claim 2, wherein the determining whether the difference between the electrical change amounts of the target electrical amount and the reference electrical amount satisfies a preset condition includes:
determining an electrical variation difference between the target electrical quantity and the reference electrical quantity;
and determining whether the electrical variation difference is smaller than a preset variation difference threshold.
5. The method of claim 4, wherein the target time is a time corresponding to a target time period; the determining a difference in electrical variation between the target electrical quantity and the reference electrical quantity includes:
determining the variation of the target electrical quantity in the target time period to obtain a first variation;
determining the variation of the reference electrical quantity in the target time period to obtain a second variation;
determining a variation difference value of the first variation and the second variation as the electrical variation difference value.
6. The method according to any one of claims 1 to 5, wherein before determining the operation state change information of the power equipment according to the similarity between the target electrical quantity and the reference electrical quantity, the method further comprises:
determining a fixed acquisition time point of the electrical quantity acquisition data according to a preset acquisition frequency;
randomly selecting at least one acquisition time point from the fixed acquisition time points as the target time;
determining the target electrical quantity corresponding to the target time in the electrical quantity acquisition data;
determining the reference electrical quantity corresponding to the target time in the reference electrical quantity waveform.
7. The method according to any one of claims 1 to 5, wherein the acquiring a reference electrical quantity waveform comprises:
acquiring historical electric quantity acquisition data of the power equipment in a set historical time period;
and the trigger waveform generation model constructs a trigonometric function waveform according to the historical electrical quantity acquisition data to obtain the reference electrical quantity waveform.
8. An apparatus for generating an electrical quantity waveform, the apparatus comprising:
the acquisition data acquisition module is used for acquiring the electric quantity acquisition data of the power equipment; the electric quantity acquisition data corresponding to the target time is the target electric quantity;
the reference electrical quantity waveform acquisition module is used for acquiring a reference electrical quantity waveform; data corresponding to the target time in the reference electrical quantity waveform is a reference electrical quantity;
the change information acquisition module is used for determining the running state change information of the power equipment according to the similarity between the target electrical quantity and the reference electrical quantity;
the data updating module is used for updating the electrical quantity acquisition data according to the running state change information;
and the waveform generating module is used for generating the electrical quantity waveform of the electrical equipment according to the updated electrical quantity acquisition data.
9. A computer device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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